Your browser opens the recording.
It is decoded by your browser's own decoder at 44.1 kHz, and the page draws it as bars.
SOLIPSIUM Super resolution audio engine
Free audio tool
Play a recording backwards and save it.
Reverse a whole recording, or only one part of it, in your browser. Play it backwards, then save it as an MP3 or a WAV.
Drop a recording here
Your browser reverses it on this device. The file is not uploaded.
MP3, M4A, WAV, FLAC, OGG, Opus or WebM, up to 30 minutes or 200 MB.
Your recording
Save it
The MP3 is 192 kbps. The WAV keeps 16-bit samples in a larger file.
How it works
The samples are written back to front.
A recording is a long row of samples, 44,100 a second on this page. Reversing writes that row in the opposite order, so the last moment plays first. Each channel is reversed on its own, so the left side stays on the left.
You choose what to reverse.
With Start and End at the two ends, the whole recording plays backwards. Move them closer and only the part between them is reversed. Play then starts a second before that part and stops a second after it, so you hear where it sits.
It is saved as MP3 or WAV.
The MP3 is made with lamejs, a JavaScript port of LAME, under the GNU LGPL, and folds more than two channels into stereo. The WAV keeps every channel.
Questions
Before you reverse.
Can I reverse only part of it?
Yes. Move Start and End to the part you want. Only that part plays backwards, and the saved file keeps the rest of the recording around it as it was.
Does reversing lose quality?
Reversing changes only the order of the samples. The WAV keeps them as 16-bit samples. The MP3 compresses the sound again at 192 kbps, which loses a little, so save the WAV if you will edit it further.
Can I reverse the sound of a video?
Save the video's sound first with Extract audio from a video, reverse it here, then put it back with Add audio to a video.
Why does reversed speech sound so strange?
Spoken sounds start sharply and die away. A t or a k is a short burst, and a vowel fades out. Played backwards, each fade becomes a swell and each burst lands at the end of a sound, so words come out as swells that stop suddenly.
Which files open here?
Whatever your browser's own decoder opens. WAV, MP3, FLAC and WebM open in every current browser, and M4A, Ogg and Opus in most. AMR, the format many Android phones save voicemails in, does not open in Chrome, Edge or Firefox.
Is my file uploaded?
No. Your browser opens the recording, reverses it and writes the new file on this device. This page sends no audio to Solipsium.
More tools that run in your browser.
The free tools page lists each free tool, grouped by what it does.